An observer in the Northern Hemisphere watches the sky for several hours. Due to the motion of Earth, this observer notices that the stars near the north celestial pole appear to move
a. counter clockwise around the celestial pole.
b. clockwise around the celestial pole.
c. from left to right.
d. from right to left.
e. nearly vertically upward.
A
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A student lifts a weight of 10.0 N a distance of 0.500 meters. The energy needed to do this work in calories is (1 cal = 4.186 Joules)
A. 0.570 cal. B. 0.750 cal. C. 1.19 cal. D. 1.75 cal. E. 2.30 cal.
It takes less and less time to fuse heavier and heavier elements inside a high mass star
Indicate whether the statement is true or false
The wavelengths of radiation from a star that is moving perpendicular to us
A) can be longer or shorter depending on the distance to the star B) are shorter than if the star were not moving C) are longer than if the star were not moving D) are the same as if the star were not moving
Hubble divided the spirals into normal and ________ categories
Fill in the blank(s) with correct word